Utheria

Litter size

Litter size data must be qualified using the ‘Count made’ list, which specifies whether the given litter size is evaluated before birth (eg. no. of embryos counted), at birth (where researcher present at birth event) or after birth. It is not necessarily the number emerging from a pouch or den or hibernation: such surrogates are not acceptable without justification or additional evidence that this represents the true number of infants.

Note that, for marsupials, litter size is the number of young born, including supernumary young (i.e. those in excess of the number of teats and therefore certain to die). The number of teats is recorded separately, so where litter size exceeds teat number this will be adjusted before analysis.

Generic value types: Data Value, Data Range, Measure, Sample Size, Captivity Status and Source Type